She called him Grayson and looked after him for months, while care workers tried to track down his biological mum.

"No one answered the ad posted in the newspaper or came back to the hospital in search of the boy," she said.

"Part of me was relieved that no one came forward, so that he would be mine forever with no opposition. But there was always a pit in my stomach about one day having to tell my son no one showed up at his termination hearing."

Katie officially adopted Grayson when he was 11 months old, sharing how her heart "broke that day in both joy and sadness".

Less than two weeks after the adoption, Katie was asked by her caseworker if she could help out with another four-day old baby - this time a girl.

"She was cautious and seriously thought this really can't be," Katie wrote. "But she called me shortly after the meeting and said, 'Katie, I think you're right! Her story breaks my heart and I can't believe it but I am 90 per cent sure you are right and this is a miracle.'"

She later called back to explain that she was now "100 per cent sure" as they'd just found the last name the mother gave with Grayson's birth for a relative of Baby Girl.

Katie, who was at work at the time, told how she began crying in the middle of the office.

"What if Baby Girl had gone to another family?" she wrote.

"We would have never found her or Grayson's mother. The connection would have never been made! I could not believe the miracle that had just happened."

On December 28 last year, Hannah officially joined Katie's family, and now has another partner in crime who will forever be a part of his life.

Katie's adventure doesn't stop there, as 13 months after Hannah was born, her and Grayson's birth mother welcomed another baby boy into this world who Katie is fostering with great hopes to adopt in 2019.

This article originally appeared on The Sun and was reproduced with permission